464 General Notes. [June, 
submitted to the Queckett Club a description of a newly con- - 
trived growing slide which is easily made, and which answers its 
purpose remarkably well. A glass ring is cemented to a3 x I 
slip, forming a cell one-eighth of an inch deep and three-quarters _ 
of an inch in diameter, as if for mounting an object. A small 
hole is bored through the slip inside of this cell, and. near its 
ed e objects (as Bacteria, &c.) are placed in a very 
minute drop of water upon a thin cover-glass which is then 
inverted upon the cell and attached to its ring by a little 
lard, the drop with its objects being within the cell but touch- 
ing only the cover-glass. nother 3 x ‘1 slip is then placed 
below the perforated one and attached to it by india rubber bands 
passed around the ends. One end of the whole combination is 
then placed in a little water which spreads between the slips by 
capillary attraction, and by evaporation passes through the hole 
into the cell, and prevents the drop of water at the top of the cell, 
from drying up. A small fraction of a drop of water may thus 
be maintained without serious loss for weeks together, the objects 
it contains being meanwhile in a most favorable position for 
microscopical study. Mr. T. C. White reminded the members 
that it was easy to drill the hole through the glass slip by using 
a steel drill ground to a three-sided point and well hardened by 
heating and then dipping in turpentine. The hole should be 
bored half way through from one side, and then from the other, 
and then cleared out with a small file. 
_ . COLLECTING AND Mountinc Spipers’ Wess.—In an interesting 
paper on this subject read before the Queckett Club, Mr. Geo. 
Hind states “that he found it unsatisfactory to take the web 
directly upon the glass slide, it being difficult to secure the desired 
portion of the web or to free it from the moisture that is present. 
He prefers to take pieces of wire about twelve inches long, bent 
into rectangular frames and gummed to secure adhesion of the 
web. This frame is carefully brought up against the selected 
portion of the web, which adheres, and the surrounding portion 
of web is cut away with a pair of scissors. The frame with its 
adherent web is then placed in a racked box until the web and 
any insects it may contain are perfectly dry. When ready for 
mounting, a thin paper cell is fastened to a glass slip, and its 
upper surface slightly gummed and brought in contact with the 
web, The surrounding web is cut away with scissors, another 
thin paper cell is placed above the first, the web being thus left 
stretched between them, and a cover-glass affixed in the usual 
way. In this manner may be obtained many small insects that 
are with difficulty found in any other way. Finding that several 
spiders that were kept in confinement in order to obtain goo 
threads for mounting, would not at first spin threads, and being 
unwilling to wait for them to commence, the author occasionally 
` shook the spider to make it spin stray threads, and in so doing 
